package io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class ReadStringDemo {
    public static void main(String[] args) throws IOException {
        File file =new File("fos.tst");
        FileInputStream fis =new FileInputStream(file);

        byte[] data=new byte[(int) file.length()];
        fis.read(data);
        String line =new String(data, StandardCharsets.UTF_8);//将data的字节还原为字符串
        System.out.println(line);
        fis.close();
    }
}
